An airline industry report says an entertainment system short-circuited, smoked and heated the insulation aboard two Canadian Airbus 320 planes. The report reveals that a taping unit related to the entertainment system on board gave off `sufficient heat to cause burning of the insulation blanket above`. The report also states that the troublesome unit is being replaced on the A320, but that the supply of modified ones has been slow. A spokesman for Airbus said the taping unit merely overheated and smoked due to short-circuited wires with no risk of fire. (Broadcast News)